The classical literature of Greek, and especially of Roman, antiquity was during the Middle Ages in the West by no means so completely unknown and unstudied as is commonly supposed. Rulers like Charlemagne, Charles the Bald, Alfred the Great, and the German Ottos encouraged its study. Such scholars as Erigena, Gerbert, Barnard Sylvester, John of Salisbury, Roger Bacon, etc., were relatively well acquainted with it. Moorish learning from Spain and intercourse with Byzantine scholars spread classical culture during the 12th and 13th centuries, and the Hohenstaufen rulers were its eager and liberal patrons. In the 14th century the founders of a national Italian literature, Dante, Petrarch, and Boccaccio, earnestly cultivated and encouraged classical studies. But an extraordinary revival of interest in such pursuits took place during the 15th century. The meeting of Greeks and Italians at the Council of Florence in A.D. 1439 (§ 67, 6) gave the first impulse, while the Turkish invasion and the downfall of Constantinople in A.D. 1453 gave it the finishing touch. Immense numbers of Byzantine scholars fled to Italy, and were accorded an enthusiastic reception at the Vatican and in the houses of the Medici. With the aid of printing, invented about A.D. 1450, the treasures of classical antiquity were made accessible to all. From the time of this immigration, too, classical studies took an altogether new direction. During the Middle Ages they were made almost exclusively to subserve ecclesiastical and theological ends, but now they were conducted in a thoroughly independent spirit, for the purpose of universal human culture. This “humanism” emancipated itself from the service of the church, assumed toward Christianity for the most part an attitude of lofty indifference, and often lost itself in a vain worship of pagan antiquity. Faith was mocked at as well as superstition; sacred history and Greek mythology were treated alike. The youths of all European countries, thirsting for knowledge, crossed the Alps, to draw from the fresh springs of the Italian academies, and took home with them the new ideas, transplanting into distant lands in a modified form the libertinism of the new paganism that had now over-run Italy.